[osCmax V2.0.25] Altering code to work from a different directory

[mraeryceos]

I have oscmax installed in public_html\catalog
I have a file with the following code in public_html
The code was originally made to work from the public_html\catalog, but I have tried inserting the word 'catalog' here and there within the code, without really knowing the syntax. Please let me know if I got it right, which I don't think I did because it doesn't work.

<?php
   if ((USE_CACHE == 'true') && empty($SID)) {
     ;
   } else {

     if ( DISPLAY_DHTML_MENU == 'Dhtml' ) {
       include('catalog/' . DIR_WS_BOXES . 'categories_dhtml_dropdown.php');
   } else {

  function tep_show_category($counter) {
    
// BoF - Contribution Category Box Enhancement 1.1
    global $tree, $boxContent, $cPath_array, $cat_name;

    $cPath_new = 'cPath=' . 'catalog/' . $tree[$counter]['path'];
    $boxContent .= '<li><a href="';
    $boxContent .= tep_href_link(FILENAME_DEFAULT, $cPath_new) . '">';
   
// display category name
    $boxContent .= $tree[$counter]['name'];

                if ($cat_name == $tree[$counter]['name']) {
                        $boxContent .= '</span>';
    }

//         EoF Category Box Enhancement

    $boxContent .= '</a></li>';

    if (SHOW_COUNTS == 'true') {
      $products_in_category = tep_count_products_in_category($counter);
      if ($products_in_category > 0) {
        $boxContent .= '&nbsp;(' . $products_in_category . ')';
      }
    }

    if ($tree[$counter]['next_id'] != false) {
      tep_show_category($tree[$counter]['next_id']);
    }
  }
?>

<!-- categories //-->
<?php

  $boxContent = '';
  $tree = array();

  $categories_query = tep_db_query("select c.categories_id, cd.categories_name, c.parent_id from " . TABLE_CATEGORIES . " c, " . TABLE_CATEGORIES_DESCRIPTION . " cd where c.parent_id = '0' and c.categories_id = cd.categories_id and cd.language_id='" . (int)$languages_id ."' order by sort_order, cd.categories_name");
  while ($categories = tep_db_fetch_array($categories_query))  {
    $tree[$categories['categories_id']] = array('name' => $categories['categories_name'],
                                                'parent' => $categories['parent_id'],
                                                'level' => 0,
                                                'path' => $categories['categories_id'],
                                                'next_id' => false);

    if (isset($parent_id)) {
      $tree[$parent_id]['next_id'] = $categories['categories_id'];
    }

    $parent_id = $categories['categories_id'];

    if (!isset($first_element)) {
      $first_element = $categories['categories_id'];
    }
  }

  tep_show_category($first_element); 

$box_base_name = 'dropdown';
include (bts_select('boxes', $box_base_name)); // BTS 1.5
}
}
?>

[mraeryceos]

This is what I needed:

<?php
chdir('catalog');
require('includes/application_top.php');
?>

Also, the code above has an error:
$cPath_new = 'cPath=' . 'catalog/' . $tree[$counter]['path'];

cPath has not to do with a path, but with some kind of database ID number, so it should remain as it originally was:
$cPath_new = 'cPath=' . $tree[$counter]['path'];